All I can offer is one experience. It was an expensive coti that I couldn't get to "hit" no matter what ..... until I took a shave ready razor to it and after shaving with it once ... next day did water only finishing strokes on that problem child coti. The edge was definitely improved. So I don't know if that is any help. I did have a member send a coticule to me a couple of years ago for testing.

He had already sent it to someone else and they said they couldn't do anything with it. I tried and tried, one method after another, and had to give up in defeat and sent it back with condolences. So like I said before .... best of luck with it, hope you can figure it out.